Grease trap



oct. 2o, 1936. I G. J. DEHN` 2,057,883

' GREASE TRAP ct. 20, 1936. G. J, Dl-:HN K 2,057,883

GREASE TRAP Patented Oct. 20, 1936 UNiTEDP STAT ES.Y

PATENT OFFICE GREASE TRAP George J. Dehn, Chicago. 111.

Application March 19, 1932, Serial No. 5999917 'I'he invention relates to grease traps.Y Qne.. objectof the invention isto provide a greasev trap. oflr the `c-atch-basin typev containin g.4 means for separatingV grease fromy drainage, -.with means for separating the solidy matterirom the drainage before the drainage passes into the grease Vretaining chamber.

Anotherobject of the invention isv to provide anfimproved. cooling unit for the grease in the lotlbasin, which: consists of. a coil of pipe which can'be easily assembled in the basin and is efcientin, cooling. I

ther"objects will be apparent from a consideration of the following detailed description;

15;: The invention `consists in the several novel features which. are herein-after set forth andare more` particularlywpointed out` by the claims at the conclusionhereof..v

Inthe drawings-1 Fig. 1 is a Vertical sectionV 20of Ya grease. trap embodying the invention. Fig.`

2visa horizontal. sectionon the line 2 2 of Fig.. L.- Fig. 3 isa. Vertical section on the line 3'-3. of.. Fig. 2. Eig. la` is a horizontal section` on. the. line 4-4 of Fig. 3.

25. The. invention is exempliiied` in a grease trapA comprising a basin having acylindrical sidewall, 6 and an integral bottom l. The basin is open, at the top to. provide access to the inside and' a top-cover 8: is removably secured tothe.

305 top `margin of the side wall 6A by screws 9.. An. inlet pipe I is threaded into an opening VI2 in a nipple H on the side-wall 6 adjacent the top of: the basin to Vdeliver the drainage. to thebasin.. A shortY horizontal pipe-section. I3` is 35,"thread`ed into the inner end of opening l2. A. YT-tting lli has its central br-anch threaded to the inner end of pipe-section I3. A vertical. pipe I is` threaded to and extends vertically through the endy branches of tting. Ill'. An:

40;. opening l5 is providedv in pipe l5 through which drainage from pipe I3 will flow into pipe l5. The upper end. of pipe i5 is open but terminates substantially at' the cover 8 and above the high-f est liquid level, sothat drainage cannot escape 4.5,f1tlirough the top ofA the pipe I5A into the basin. A retainer with. a tubular wall l1 andV a` closed bottom I8 isdisposedin the pipe |5to strain the solids from the drainage. This retainer has, an upwardly iiared mouth |9- at its upper end o--which ritsV in the pipe l5 and directs-the drainage entering the pipe l5 into the retainer. The portion of the retainer immediately below its mouthis providedwith holes to permit the liquid and grease inthe drainage to flow into 55; the portion of the pipe l5A below the mouth I9.

(Cl. B10-56) The tubell'l of the retaineris smaller in diameter than the pipe I5 to provide an annular down'.-` ward passage for the drainage; Set screws 2l removablyA support the retainer lfl in the pipe l5; The lower end of' pipe I-5.- is open to per- 5f mit the'strained drainage to pass into the lower portion of the basin at one side of the baille hereinafter described. Adjacent` itslower end', pipey l'5 isV perforated as at 22 to dischargesome of the drainagelaterally into the basin. This 10* breaks up` or distributes the ow and prevents sufficient flushing to carry the grease from: the basin, and retards the flow, so the grease'in. the drainage canfbe cooled and separated; Pipe I3- is O smaller'in: diameter than the inlet pipe l0'to're l5 tard the delivery'of the drainageto the basin, for the same purpose; A spider or frame 23:V is attached to. the lower end of wall I1, and comprises downwardly and outwardly inclinedl legs 24; a connecting ring. 25l at the lowerA ends of 20 the legs, and a ring 26 at their upper ends.` The' grease in. the drainageV flowing downwardly be` tween retainer l1. and pipe: l5.A impacts against' this spider andis disintegrated so it' can be more readily cooled. 25

The improved cooling device consistsV of: a coil of. pipe in the basin and: through which water is circulated. The coil isformed: of a continuous length of pipe bent toy conduct cool-` ing' water around the outside of and diametri-l 3U cally across the lower portion of the: chamber in the basin, and around the outside of' the upper portionof said chamber. For this purpose, the cooling pipe comprises a series of alternately and. oppositely arranged semi-circular loops 28 35` and 29 serially connected by diametrically eX- tending members 30` which constitute a baffle in the lower portion of the basin where the drain-` age isY discharged from downtake pipe l5', and a series of helical coils 3l in they upper portion 40 of the basin. The lower end of this pipe-coil is extended through theL side wall of the basin, as at 32, for connection toa supply pipe for cold water, and its upper end 33 extends through the side wall of the basin, for connection to a drain pipe, so that cooling water may be constantly circulated through the coil to congeal the grease in the drainage. The loops- 28 and 29 of the coil contact with the drainage around the side of the basin and the diametric members.V 30 coil contact the drainage in' the central portion. The downtake pipe l5 is located adjacent one side of the diametric members 30, so that it will pass over, or be baled by, said members ot the coil in transit to the discharge 4 portion of the basin.

side of the basin. These members act as a baille, but, if desired, a plate may be placed across one side of them to prevent drainage from leaking between them into the discharge side of the basin.

A discharge connection for the drainage from which the grease has been separated comprises a vertical pipe-section 36 having its upper end connected to an elbow 3l and a short horizontal pipesection or nipple 38 which is connected to said elbow and threaded into a hole 39 in the side of the basin opposite to the inlet opening l2. A pipe the sewer. upper portion of the basin to prevent pressure in the basin.

In operation, the drainage from kitchens orv other places flows into the upper end of downtake pipe I5 and thence into the retainer l1.

The coarse solids in the drainage settle in fthe retainer and are thus separated therefrom to prevent them from passing into the cooling chamber in the basin. This retainer is provided with a bail 42 and is removable through the top of pipe l5 when the cover 8 has been removed, so the accumulated solids can be easily removed as often as necessary. The drainage passes from the retainerithrough holes 20, thence downwardly in pipe l5 and around tube Il, and is discharged through the lower end of pipe I5 and also laterally through holes 22. Any large pieces of grease are broken up by the spider at the lower end of pipe I5. Pipe l5 delivers the drainage into the -basin at one side of baffle 35 and coil-member 30,

so that it must pass over them before reaching the outlet pipe 36. This causes the drainage to contact with the cooling coil to congeal eiciently the grease so it will rise and collect in the upper The helical coils 3| in the upper portion of the basin will further cool the drainage. The drainage, after it has passed over the baffle, and the grease has been separated therefrom, will pass into the lower end of pipe 36 and be discharged through pipe 40. A column of water remains in the basin upto the level of the pipe and the grease floats on the water.

The invention exemplifies a grease trap, which is provided with a device for separating the solids from the drainage before it is cooled; in which the flow of the drainage is retarded foreflicient separation of the grease; in which the cooling unit consists of a coil of pipe which is separate from l the basin and bent to form a baille, and extends to the upper portion of the basin for efcient cooling and separation; and in which the retainer for the solids can be easily unloaded of the accumulation therein. When the cooling unit is formed of a coil of pipe, a heavy casting is dispensed with and the unit can be easily removed for repair.

The invention is not to be understood as restricted to the details set forth, since these may be modied within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to securel by Letters Patent, is:

1. In a grease trap of the characterdescribed, the combination of a basin, comprising a continuousv side wall and a bottom, an inlet pipe for drainage connected to the upper portion of the basin, a vertically extending down-take pipe disposed in the basin in spaced relation with respect to the side wall, connected at the upper end thereof to receive drainage from said inlet pipe and having holes in its lower end for discharging the drainage laterally into the lower portion of the basin, a tubular retainer with a closed bottom for solids, arranged in the downtake pipe to receive the drainage upon entry thereof into the down-take pipe from the inlet pipe, said retainer being spaced from the inner face o-f the down-take pipe so as to form an annular passageway therebetweenand being provided with openings adjacent its upper end to discharge the drainage into such passageway for l down ow to the openings in the lower end of the down-take pipe, and an outlet connection comprising a pipe to receive the drainage adjacent the bottom of the basin.

2. In a. grease trap of the character described,

the combination of a basin, an inlet pipe for drainage connected to the basin, a down-take pipe connected to receive drainage from said inlet pipe and to discharge into the lower portion of the basin at one side thereof, a tubular retainer with a closed bottom for solids, disposed in the down-take pipe and provided with openings adjacent its upper end to discharge into the downtake pipe, the down-take pipe being open at its lower end and provided with openings in its side, and an outlet connection comprising a pipe to receive the drainage adjacent the bottom of the basin.

3. In a grease trap of the character described, the combination of a basin, an inlet pipe for drainage connected to the upper part of the basin, a down-take pipe connected to receive the drainage from said inlet pipe and to discharge into the lower portion of the basin at one side thereof, a tubular retainer with a closed bottom for solids, disposed in the down-take pipe and pro-vided with openings adjacent its upper end to discharge into the down-.take pipe, the down-take pipe being open at its lower end, means adjacent the lower end of the down-take pipe for breaking up the matter in the drainage, and an outlet connection comprising a pipe to receive the drainage adjacent the bottom of the basin.

4. In a grease trap,the combination of a basin comprising a continuous side wall and a bottom, a vertically extending pipe positioned in the basin in spaced relation with respect to the side wall and having its upper end connected to receive Y drainage and its lower end open to discharge the drainage near the bottom of the basin, a vertically extending discharge pipe for the drainage positioned opposite the inlet pipe in spaced relation with respect to the side wall and having the lower end thereof open to receive the drainage and its upper end connected to discharge the drainage fromvthe basin, a cooling unit for congealing the grease in the drainage as the latter flows through the basin, consisting of a coil of Y pipe disposed in the basin in direct contact with the drainage and comprising substantially horizontally extending loops encircling the inner face of the side wall of the basin and extending around the inlet and discharge pipes and cross members connected serially with the loops and forming a baiiie across the bottom of the basin and between the lower ends of the inlet and discharge pipes, and means for circulating a coolingfluid through the coil of pipe.

- 5. In a grease trap, the combination of a basin comprising a continuous side wall and a bottom, a vertically extending pipe positioned in the basin in spaced relation with respect to the side wall 75' pipe disposed in the basin in direct contact with the drainage and comprising large loops around the central and upper portions of the inlet and discharge pipes and small loops around the lower ends of said pipes connected serially to the large loops and shaped to form cross members for forming a baille between the lower ends of the inlet and discharge pipes, and means for circulating a cooling fluid through the coil of pipe.

GEORGE J. DEI-IN. 

